Propeller.



AMNELIUS.

' PROPELLER.

APPLICATION TILED APR. 0, 1909v I Wnup Elvwenioz Patented Sept. 7, 1909.

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Witnesses 12m? J 4 (L -1n L's/1 W" 4 is a view similar to Fig. 2 withthe rnnonorm amvnmus, or soUTH FBAMINGHAM, mAssAoHUsE'rTs.

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Specification Of LCttGIS Patent.

Patented Sept. 7, 1909.

Application filed April 6, 1909. Serial No. 488,245.

To allwhom it may concern:

Be it known that I, THEODORE AMNELIUs, a. citizen of the United States,residing at South Framinghamfln the county of Middlesex and $tate ofMassachusetts, have invented certam new and useful Im rovements 1nPropellers; and I do hereby eclare the following to be a full,-clear,and exact de scription of the invention, such aswill enable 'othersskilled in the art to which it apperta ns to make and use the same.

TlllS invention relates to propellers, adapted for use wlth any approvedcraft moving in a fluid medium.

An object of the invention is to providea propeller having a-pluralityof blades positroned forengagement with the fluid med1um and of.conformation to prevent the centrifugal discharge of the medium from theends of the propeller blades A further ob ect of the invention is toprovide a propeller having integral blades attached to a hub of improvedconstruction. With these and other objects in view, the lnventloncomprises certain novel constructions, combinations and and claimed.

In the drawings :Figure 1 is a view of the improved propeller in rearelevation. Fig. 2 is a view of the propeller in side or edge elevation.Fi 3 is a view of the hub with the propeller b ade broken away. Fig;

hu sections separated.

Like characters of. reference designate corresponding parts throughoutthe several views. I Y o I Like co-pending application No. 472,326, thedevice which forms the subject-matter of this application comprises aplurality of propeller blades mounted s1de as m that application is hereillustrated as composed of three sub-blades. In the present Instance thesub-blades are provided w1th a plurality of curves as 10, 11, 12 and13,

the curve lobeing preferably provided with two'faces, 11 with threefaces, 12 with four faces, and 13 with five faces, such faces be ingpreferably plain and set at an arigle to its adjacent face as clearlyshown at 1g. 2.

In addition to the number of faces increasing from 10 to 13 the size ofthe curvesalso increases, the size of the faces remaining.

substantially the same and the area of the curved portions increasmg asthe number of arrangements ofparts, as W111 beheremafter fully describedy'side and here shown formed integral or rigid with the hub and as shownat Fig. 1 three of the sub-blades are connected wlth each of the hubsections. The device is mounted on a shaft as 14 and the hub sectionsare shown as a whole at 15 16 and 17. The hub section 15 is intended tobe the first hub section upon the shaft 14 and is provided with a recess18 positioned to receive the overhang 19 of the hub section 16, said hubsection 16 being also provided with a recess 20 proportioned to receivethe overhang 21 of the hub section 15.

Preferably the hub sections are provided for convenience with as many ofsuch recesses and overhangs as the number of blades so that one of theoverhangs is practically formed by the inner extremity of the bladefaces. The sub-blades are, of course, as.

while therecess is dis osed between adjacent hang 23 of the hub section17 which, in like manner, is-provided with a recess 24 adapted toreceive the overhang 25 of the hub section 16. The recesses andoverhangs of the hub sections 16 and 17 are the same essentially as therecesses and overhangs of the sections 15 and 16 and similarly dis osed.

As shown in Fig. 4 the ub sections are separated showin the recesses andoverhangs while in Fig. 3 the hub sections are shown in engagingposition and held in such position by the shaft. p

While the propeller has been here shown as rovided with three sub-bladesit is to be understood that an approved number of blades may be emp oyedand in case more than three blades are employed all the intermediateblades are provided with hub seethe nut 26 uponthe extremity of tionssimilar to the hub sections 16, the outer hub sections onlycorresponding to the hub sections 15 and 16.

What I claim is 1. A propeller provided with mg a plura it plurality ofp a blade havofcurves made up each of a ain faces disposed, at an angleto each other with the numberof faces 1ncreasing from the endof theblade. 2. In a propeller,

ity of curves ncreasing in area from t e centen to the peripheral end,such curves being com osed ofp ain surfaces of substantially aqua widthdisposed atangles to each other.

center to the peripheral a blade having a lural- 3. In a propeller, aplurality of sub-blades each provided with a plurality of similar curvessimilarly ositioned and each composed of a plurality of plain facesdisposed at angles to each other.

4. In a propeller, a hub provided with a plurality of blades and with arecess and overhan for each blade, and an adjacent hub section providedwith a recess to receive the overhang, and an overhang to engage withinthe recess.

5. 'In a pro ller, a plurality of hub sections, a plura ity of blades,the central secsections each tion being provided with two recesses andtwo overhangs for each blade, and outer hub rovided with a recess toreceive each of t e overhangs of the inner hub section, andan overhangto engage within each of the recesses of such inner hub section.

In testimony whereof I aflix my signature in presence of two witnesses.

THEODORE AMNELIUS.

Witnesses: v

O. MITCHELL, THOMAS H. OCo mon.

